av: Add support for STE multimedia - Part 1

Change-Id: I29d266340aad9acb69a7ad9e7d16701844621312

Conflicts:
	camera/CameraParameters.cpp
	include/camera/CameraParameters.h
	include/media/stagefright/OMXCodec.h
	media/libstagefright/ACodec.cpp
	media/libstagefright/OMXCodec.cpp